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RE7.A. - Page 435 Expansion Project#:11637.0 Auyus�v,�v�� Page 20 EXPANDED FUEL STATION TRAFFIC CHARACTERISTICS This section summarizes preliminary information on the expected transportation characteristics and impacts associated with expanding the existing fuel station from 3 islands (12 fueling positions) to 5 islands (20 fueling positions). In particular, this section discusses the expected change to trip generation and site operations at the fuel station (queuing, wait times) with the proposed expansion to 5 islands (20 fueling position) in place. Costco Transportation Database For the past fifteen years, KAI has maintained a database of traffic data and transportation characteristics for Costco Wholesale. The database contains transportation information such as trip generation, trip type percentages, and parking demand for Costco locations in the United States, Canada, and Mexico. The database is updated and refined each time new Costco traffic counts or information become available to KAI. The Costco database was determined as the best source from which to develop the trip generation estimate for the Redwood City Costco Gasoline expansion project since it provides use-specific data that most accurately represents the anticipated traffic characteristics of the project. Costco has invested significant effort into developing this use-specific trip generation database for both their warehouses and their fuel stations because of the unique characteristics of Costco customer travel that exist due to membership requirements and the nature of Costco sales (typically larger volume purchases and lower frequency visits than traditional retailers). These unique elements apply to the trip generation for Costco warehouses, Costco Gasoline fuel stations, and the interaction of trips between the two. The database currently has traffic information from numerous locations in large metropolitan areas of California (Bay Area, LA Area, and San Diego). In addition, given that the proposed site plan for the Redwood City location is to expand the existing 3 island fuel station (12 fueling positions) to a 5 island (20 fueling position) facility, data from the two existing 5 island Costco Gasoline facilities in the continental United States (Scottsdale and Tucson, Arizona) was also collected and evaluated to prepare the trip generation estimate for the Redwood City expansion project. Costco Gasoline Trip Characteristics An important trend seen from trip generation studies at over 20 Costco Gasoline facilities is that trip generation is not directly related to the number of islands (or fueling positions) at a facility.Although the standard reference manual ITE Trip Generation (8th Edition) currently reports trip generation for gasoline stations based on the independent variable of fueling positions, more recent transportation studies indicate that other variables besides the specific number of fueling pumps have a much larger Kittelson&Associates,Inc. Boise,Idaho